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c9052e6e85
The mFrameMetrics.mZoom was previously a "resolution-independent" zoom, which meant it had to always be multiplied by the CalculateIntrinsicScale() value to be useful. This patch converts it to a "resolution-dependent" zoom, and includes the intrinsic scale multiplier already. This means it needs to be updated if either the viewport or composition bounds (which determine the intrinsic scale) change, but there are only a few places where this happens and it makes the rest of the code cleaner.
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_SCALEFACTOR_H_
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#define MOZILLA_GFX_SCALEFACTOR_H_
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#include "gfxPoint.h"
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namespace mozilla {
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namespace gfx {
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/*
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* This class represents a scaling factor between two different pixel unit
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* systems. This is effectively a type-safe float, intended to be used in
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* combination with the known-type instances of gfx::Point, gfx::Rect, etc.
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*
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* Note that some parts of the code that pre-date this class used separate
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* scaling factors for the x and y axes. However, at runtime these values
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* were always expected to be the same, so this class uses only one scale
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* factor for both axes. The two constructors that take two-axis scaling
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* factors check to ensure that this assertion holds.
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*/
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template<class src, class dst>
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struct ScaleFactor {
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float scale;
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ScaleFactor() : scale(1.0) {}
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ScaleFactor(const ScaleFactor<src, dst>& aCopy) : scale(aCopy.scale) {}
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explicit ScaleFactor(float aScale) : scale(aScale) {}
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explicit ScaleFactor(float aX, float aY) : scale(aX) {
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MOZ_ASSERT(fabs(aX - aY) < 1e-6);
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}
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explicit ScaleFactor(gfxSize aScale) : scale(aScale.width) {
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MOZ_ASSERT(fabs(aScale.width - aScale.height) < 1e-6);
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}
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ScaleFactor<dst, src> Inverse() {
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return ScaleFactor<dst, src>(1 / scale);
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}
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bool operator==(const ScaleFactor<src, dst>& aOther) const {
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return scale == aOther.scale;
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}
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bool operator!=(const ScaleFactor<src, dst>& aOther) const {
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return !(*this == aOther);
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}
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bool operator<(const ScaleFactor<src, dst>& aOther) const {
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return scale < aOther.scale;
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}
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bool operator<=(const ScaleFactor<src, dst>& aOther) const {
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return scale <= aOther.scale;
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}
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bool operator>(const ScaleFactor<src, dst>& aOther) const {
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return scale > aOther.scale;
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}
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bool operator>=(const ScaleFactor<src, dst>& aOther) const {
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return scale >= aOther.scale;
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}
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template<class other>
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ScaleFactor<other, dst> operator/(const ScaleFactor<src, other>& aOther) const {
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return ScaleFactor<other, dst>(scale / aOther.scale);
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}
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template<class other>
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ScaleFactor<src, other> operator/(const ScaleFactor<other, dst>& aOther) const {
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return ScaleFactor<src, other>(scale / aOther.scale);
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}
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template<class other>
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ScaleFactor<src, other> operator*(const ScaleFactor<dst, other>& aOther) const {
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return ScaleFactor<src, other>(scale * aOther.scale);
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}
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template<class other>
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ScaleFactor<other, dst> operator*(const ScaleFactor<other, src>& aOther) const {
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return ScaleFactor<other, dst>(scale * aOther.scale);
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}
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};
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}
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}
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#endif /* MOZILLA_GFX_SCALEFACTOR_H_ */
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